/*
 * Copyright 2020 eBlocker Open Source UG (haftungsbeschraenkt)
 *
 * Licensed under the EUPL, Version 1.2 or - as soon they will be
 * approved by the European Commission - subsequent versions of the EUPL
 * (the "License"); You may not use this work except in compliance with
 * the License. You may obtain a copy of the License at:
 *
 *   https://joinup.ec.europa.eu/page/eupl-text-11-12
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
package org.eblocker.server.common.util;

import java.util.Arrays;

public class ByteArrays {

    private ByteArrays() {
    }

    public static int compare(byte[] a, byte[] b) {
        if (a.length < b.length) {
            return -1;
        }
        if (a.length > b.length) {
            return 1;
        }

        return compare(a.length, 0, a, b);
    }

    public static int compare(int length, int offset, byte[] a, byte[] b) {
        for (int i = 0; i < length; ++i) {
            if (a[offset + i] < b[i]) {
                return -1;
            }

            if (a[offset + i] > b[i]) {
                return 1;
            }
        }

        return 0;
    }

    public static class Key {
        private final byte[] array;
        private final int hashCode;

        public Key(byte[] array) {
            this.array = array;
            hashCode = Arrays.hashCode(array);
        }

        @Override
        public boolean equals(Object o) {
            if (!(o instanceof Key)) {
                return false;
            }
            Key that = (Key) o;
            return this.hashCode == that.hashCode && Arrays.equals(this.array, that.array);
        }

        @Override
        public int hashCode() {
            return hashCode;
        }
    }
}
